Question

The potential difference across the terminals of a battery is 50V when 6A of current is drawn and 60V when 1A is drawn. The emf and internal resistance of the battery are

• A. 62V, 2$\Omega$
• B. 63V, 1$\Omega$
• C. 61V, 1$\Omega$
• D. 64V, 2$\Omega$

Answer 1

The correct option is A 62V, 2$\Omega$

V= E - Ir
50 = E - 6r $\to$ (1)
60 = E - 1r $\to$ (2)
(2) - (1) 10 = 5r; r = 2$\Omega$
E = 62V